Requires Munin::Plugin as supplied in Munin 1.3.3 and 1.2.5. If the plugin complains about "Use of uninitialized value in string eq at /usr/lib/perl/5.8/lib.pm line 29." and so on please make this plugin configuration:

[*]
env.MUNIN_LIBDIR /usr/share/munin

using the correct LIBDIR for your installation of course (the other standard value is /opt/munin/lib).